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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...into the lower part of the stomach, the cardiac pouch becomes gradually reduced in size until finally when the stomach is empty its outline, as revealed by radiographs, departs from the pyriform shape characteristic of the full organ to assume a more or less tubular form. From this description it is evident that the function of the cardiac portion of the stomach is to serve as a reservoir for the food which by a slow contraction of the gastric wall is gradually delivered into the lower and more motile portion of the stomach. The motor phenomena of this portion are of a complex nature and will now be considered. Cole,30 by the employment of serial x-ray photographs taken at short intervals has shown that this portion of the stomach undergoes a succession of rapid changes in shape (Fig. 156), due to the peristaltic waves which course over this region toward the pyloric sphincter. The waves Fijr. 154. the-stomach F, fundus; IA, incisura angularis; B. body; PC, pyloric canal; P. pylorus. The antrum is the portion from IA to PC inclusive. (From Cannon.) in their passage do not progress as an unvarying band of constriction but exhibit alternately phases of increased and diminished tone--phases of contraction and relaxation. The period of gastric activity intervening between a phase of complete relaxation and the reappearance of this phase is termed a gastric cycle. In some types of gastric motility a peristaltic wave takes but one gastric cycle to complete the journey from its origin to the pylorus. Such a wave would show in consequence one phase each of complete relaxation and maximal contraction. In other types two, three or four gastric cycles may occur during the passage of the wave. The waves therefore are spoken of as one, two, three or Fig. 155.--Outlines ...

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